Gas exchange in Fish

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Created by: esunderland116
Created on: 02-10-19 14:44

Do fish have a small or large surface area to volume ratio?

small

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What feature have fish evolved to have to increase gas exchange?

Gills

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What are gills made up of?

Gill filaments

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How are gills stacked?

in a pile

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At right angles to filaments are?

Gill lamellae

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Gill lamellae increase.........

the surface area

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Water is taken in through the?

mouth

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the flow are water and blood are?

in opposite directions

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This is known as?

a countercurrent flow

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Why is a countercurrent flow important?

it ensures the maximum possible gas exchangeis achieved

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What would be a result of both the water and blood flowing in the same direction?

less gas exchange

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What is one example of something that happens because of the countercurrent flow?

Blood that is already well loaded with oxygen meets water, which has its maximum concentration of oxygen. Therefore diffusion of oxygen from the water to the blood takes place

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What is another example?

Blood with little oxygen meets water which has had most its oxygen removed. Diffusion again takes place.

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What percentage of oxygen is absorbed into the blood?

80%

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What is the flow called they are in the same direction?

Parallel

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With parallel flow what would the percentage be?

50%

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Other cards in this set

Card 2

Front

What feature have fish evolved to have to increase gas exchange?

Back

Gills

Card 3

Front

What are gills made up of?

Back

Card 4

Front

How are gills stacked?

Back

Card 5

Front

At right angles to filaments are?

Back

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Gas exchange in Fish